Sensitivity: 88 dB SPL, with 2.83 volts RMS @ 1 meter, 4 pi (anechoic).

Sensitivity combined with impedance indicates how much amplifier power is required for the loudspeaker to play at satisfying volume levels. When comparing this spec to low impedance (4 ohm) designs, you must add 3 dB to the figure, since 4 ohm loads draw twice the current from the amplifier, providing the illusion of greater sensitivity, while placing more stress on the amplifier’s power supply. The moderate sensitivity of the RM25si Signature Mk2 indicates that small amplifiers can achieve realistic levels in all but the largest rooms.

Impedance: 8 ohms nominal, 6 ohms minimum.

System impedance indicates whether the speaker presents a "hard" or "easy" load on the amplifier. True 8ohm speakers are less amplifier and cable sensitive, and partner well with a broader range of amplifiers, including tube designs.

Crossover: 2-way Patented Asymmetrical Infinite Slope Crossover at 2 kHz. Additional filtering on upper woofer to enhance midrange focus.

Constructed of specially selected components, woofer and tweeter crossover circuits are physically independent. Provision for bi-amping or bi-wiring. Each network is individually precision adjusted, resulting in a virtually perfect match to the original prototype.

The steep filter slopes ensure good acoustical behavior in the crossover regions, with a minimum of acoustical interference, along with low distortion and wide dynamic range. Driver acoustic responses are in-phase throughout the crossover region.

Frequency Response:

The RM25si Signature Mk2 is delivers a very smooth and even response over a very broad listening window. Unlike conventional low order crossover designs, the speaker retains its sonic balance over a wide angle both vertically and horizontally. This results in a higher level of fidelity than a simple on axis measurement can reveal.

Listening window response: ± 2dB from 32 Hz to 20 kHz.

Dimensions and weight: 46" (1168.4 mm) H x 8.5" (215.9 mm) W x 11.5 " (292.1 mm) D. 

Shipping weight approx 70 lbs. (31.75 kg) Each